Maffei, who is challenging Rep. Ann Marie Buerkle, is running to get his seat back after losing it to Buerkle in 2010.

The New York ads bring the number of districts the chamber is involved in to a total of 19 across the country.

The chamber last week coordinated a similar assault in California, where it spent $3.3 million.

The entry into the New York campaigns by the powerful business lobby shows the importance of the Empire State in the battle for control of the House. Democrats need to pick up 25 seats to win a majority.

The chamber is targeting so-called “orphan districts” in states that will play a major role in who holds the House.